JPH0711648Y2 - Seat headrest - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a stay fixed to a seat back, a headrest main body for supporting the head of a seated person, a support member for supporting the main body, and the support member. A tilting pin for supporting the stay with respect to the stay, a disc spring fitted to the pivot pin in contact with the support member, and a press washer fitted to the pivot pin in contact with the disc spring. By caulking the tip end of the pivot pin protruding from the washer, the disc spring is pressed against the support member through the press washer, and the peripheral edge of the disc spring is pressed against the support member, so that the support member stays. The present invention relates to a headrest of a seat that is pressed against a pair to generate a frictional force between them.

[Prior Art] For example, a headrest of the above type is provided on the upper part of the seat back of a seat arranged in a room of a car or a general house,
It has been publicly known to ensure the comfort and safety of a seated person. This type of headrest is a force that overcomes the frictional force that acts between the support member and the stay, and can tilt the support member and the headrest body supported by the support member to a desired position simply by tilting the body. it can. Therefore, a complicated mechanism for tilting the headrest body is not required, and the structure can be simplified and the cost can be reduced.

The support member that supports the headrest body is pivotally supported on the stay via a pivot pin.However, in the conventional headrest, a pivot pin having a circular cross-sectional shape is used. And the circular holes formed in the support member were fitted together.

[Problems to be solved by the device]

When the pivot pin and the holes of the stay and the support member that are fitted to the pivot pin are both circular, when the headrest body is tilted, the pivot pin is sometimes moved by frictional force acting on the support member and the pivot pin in some cases. It rotates as the headrest tilts. In some cases, the frictional force between the stay and the pivot pin becomes larger than the frictional force acting between the support member and the pivot pin, and the pivot pin may remain unrotated. Thus, even if the pivot pin does not rotate or rotates, the headrest body can be tilted, but when the pivot pin rotates and when it does not rotate,
When the headrest body is tilted, the resistance force that acts on the headrest body is different, and the operating force varies. For this reason, the operator feels a sense of discomfort and impairs the smooth operation feeling.

SUMMARY OF THE INVENTION An object of the present invention is to eliminate the above-mentioned conventional drawbacks and provide a headrest of the type described at the beginning that can maintain a constant operation force acting on the headrest body for a long period of time when the headrest body tilts. .

[Means for Solving the Problems]

In order to achieve the above object, the present invention provides the headrest described at the beginning, in which the pivot pin is rotatably fitted to the stay and is not rotatable relative to the support member, the disc spring and the press washer. We propose a seat headrest characterized by being fitted to.

〔Example〕

Hereinafter, details of the present invention will be described based on illustrated embodiments.

In FIGS. 1 and 2, 1 is a seat back of a seat, 2 is a headrest provided on the upper part of the seatback 1, respectively. The seatback 1 supports the back of a seated person (not shown), and the headrest 2 is Support its head.

The headrest 2 has a pair of stays 3 and 3a fixed to the seat back 1, a headrest main body 4 that supports a seated person's head, and a support member 5 that fixes and supports the main body 4. , 3a are fixed to the seat back 1 or are fixed so that the vertical position can be adjusted. The headrest main body 4 has a pad made of a soft material such as foam on the inside of its outer skin, so that a seated person can comfortably rest his / her head on the headrest main body 4.

In addition, in FIG. 1 and FIG. 2, the seat back 1 and the headrest body 4 are shown by chain lines.

As can be seen from FIG. 1, the stays 3 and 3a, the support member 5, and the related elements described later can be configured symmetrically, so in the following description, only the configuration of the right side portion in FIG. 1 will be clarified. The description of the left side portion will be omitted. However, the left-side elements corresponding to the right-side elements are denoted by the reference numerals assigned to the right side with a added.

The support member 5 has a central portion 7 extending substantially horizontally, and a leg portion 9 projects downward from an end portion thereof. A pivot pin 10 penetrates the stay 3 and the leg portion 9, and the support member 5 supporting the headrest body 4 is moved in the front-rear directions A and B (FIG. 2) with respect to the stays 3 and 3a by the pin 10. It is supported so that it can tilt.

Further, a disc spring 11 is fitted to the pivot pin 10 in a state of being in contact with the support member 5, and a pressing washer in a state of being further in contact with the disc spring 11.
12 fits on the pivot pin 10. Then, the tip end of the pivot pin 10 protruding from the press washer 12 is tapped and caulked, and each element 11, 12, 5, 3 is assembled without detaching, and the disc spring 11 is supported by the caulking pressure. 5, the peripheral edge of the disc spring 11 is in pressure contact with the surface of the support member 5. As a result, the support member 5 is pressed against the stay 3.

In this example, the leg portions 9 of the support member 5 are formed with protrusions 13 and 13 formed of arcuate beads centering on the axis of the pivot pin 10. The protrusion tops of these protrusions 13 and 13 are stays. 3, the disc spring 11 is pressed by the elastic force so that a frictional force is generated between the protrusions 13, 13 of the support member 5 and the stay 3.

When the seated person adjusts the tilted state of the headrest main body 4 according to his / her physical condition and taste, he / she can overcome the frictional force acting between the stay 3 and the projections 13 of the support member 5 with a force that is sufficient to overcome. All that is required is to push the body 4 in the direction of arrow A or B. As a result, the headrest body 4 tilts in the direction of arrow A or B together with the support member 5. When the headrest main body 4 is brought to a desired position and the hand is released, frictional force between the stay 3 and the protrusions 13 and 13 causes the main body 4 to move.
And the support member 5 is held in that position.

Further, as clearly shown in FIG. 4, an elongated hole-shaped guide hole 15 is formed in the lower portion of the support member 5, and the stay 3 is fitted in the guide hole 15. When the headrest body 4 is tilted in the direction of arrow A and brought to the foremost end position shown by the chain line L ₁ in FIG. 2, one end 17 of the guide hole 15 hits the stay 3, and conversely the headrest body 4 is moved along the chain line L ₂ When brought to the rearmost position shown by, the other end 16 of the guide hole 15 contacts the stay 3 and the headrest body 4 is stopped at each position. In this way, the headrest body 4 can be rotated within the angle range formed by the chain lines L ₁ and L ₂ .

By the way, in the conventional headrest of this type, as described above, the pivot pin 10 that rotatably supports the support member 5 with respect to the stay 3 has a circular cross-sectional shape.
The stay 3 and the circular hole formed in the supporting member 5 were fitted in this, but according to such a configuration, when the headrest main body 4 together with the supporting member 5 is tilted in the front-back direction A, B, The pivot pin 10 may rotate or may not rotate, which may impair the operation feeling of the headrest body 4.

In order to eliminate the above drawbacks, the pivot pin 10 is used in the present invention.
However, it is rotatably fitted to the stay 3, and is fitted to the support member 5, the disc spring 11 and the press washer 12 so as not to be relatively rotatable. In this example, the pivot pin 10 is formed as follows.

That is, as shown in FIG. 3, the pivot pin 10 has its head 10
A shaft portion 102 formed integrally with 1 comprises a first shaft portion 103 formed in an oval cross-sectional shape and a second shaft portion 104 formed in the same oval cross-sectional shape. The major axis D of the first shaft portion 103 is set to be larger than the major diameter D1 of the second shaft portion 104. On the other hand, a circular round hole 50 is formed in the stay 3, and this is fitted into the first shaft portion 103 of the pivot pin 10. The round hole 50 has a diameter slightly larger than the major axis D of the first shaft portion 103. have. By fitting the hole 50 into the first shaft portion 103, the pivot pin 10 can freely rotate with respect to the stay 3. Further, the support member 5 is formed with an oval hole 51 corresponding to the first shaft portion 103, which is fitted into the first shaft portion 103. Further, oval holes 52 and 53 corresponding to the second shaft portion 104 are formed in the disc spring 11 and the press washer 12, respectively,
These are fitted to the second shaft portion 104, and the portion of the second shaft portion 104 protruding from the press washer 12 is caulked as described above. With such a configuration, the support member 5, the disc spring 11, and the press washer 12 are prohibited from rotating relative to the pivot pin 10.

As described above, the pivot pin 10 can rotate with respect to the stay 3, but cannot rotate with respect to the support member 5, the disc spring 11 and the press washer 12, so that the support member 5 together with the headrest 4 with respect to the stay 3. When tilted in the front-rear direction A, B, the pivot pin 10 is always supported by the support member 5, the disc spring 11, and the press washer 12.
Rotate with. That is, the pivot pin 10 does not rotate when the headrest body 4 tilts, or does not rotate and remains stationary, but always rotates with the support member 5. Therefore, the resistance force when the headrest body 4 tilts is always substantially constant, and the operation feeling is further improved.

The frictional force acting between the support member 5 and the stay 3 when the headrest body 4 and its support member 5 are tilted adjusts the pressure when the tip portion of the pivot pin 10 is caulked, or the pivot pin 10 is adjusted.
The length L (FIG. 3) of the first shaft portion 103 can be freely changed by appropriately setting or by selecting various types of the disc spring 11.

As shown in FIG. 5, the hole 50 of the stay 3 is formed into an oval shape, and this is fitted to the first shaft portion 103 of the pivot pin 10 which is also formed into an oval shape so that the stay 3 and the pivot pin 10 are relatively opposed to each other. The rotation is prohibited, the second shaft portion 104 of the pivot pin 10 has a circular cross-sectional shape, and the supporting member 5, the disc spring 11, and the hole 5 of the press washer 12 are formed.
Even if 1,52,53 are circular holes, and these are fitted to the circular second shaft portion 104 to rotatably support the support member 5 and the disc spring 11 with respect to the pivot pin 10, the headrest body 4 Pivot pin when tilting
It is possible to always keep 10 stationary and to keep the frictional resistance force acting when the headrest main body 4 tilts (see Japanese Patent Application No. 1-334739).

However, according to this structure, since the press washer 12 is integrated with the pivot pin 10 by caulking the tip end of the pivot pin, the press washer 12 does not rotate when the headrest body 4 tilts, but also stops. At that time, the disc spring pressed against the press washer 12
Since 11 rotates, a large frictional force acts between them.
As a result, the press washer 12 is scraped off by the disc spring 11 over time, and the plate thickness thereof is reduced. Therefore, the pressure of the disc spring 11 on the support member 5 is reduced, and the support member 5
The frictional force generated between the stay 3 and the stay 3 becomes small, and the headrest body 4 tilts with a slight force. This inevitably causes a problem that the operability of the headrest body is deteriorated.

On the other hand, in the configuration shown in FIG. 3, when the headrest body 4 tilts, both the disc spring 11 and the press washer 12 are pivot pins.
Since it rotates together with 10, the disc spring 11 and the press washer 12 do not rotate relative to each other, and no frictional force acts between them.
Therefore, the pressing washer 12 is not shaved and the pressing force of the disc spring 11 is not reduced, and it is possible to prevent the operability of the headrest from being lowered and maintain its function for a long period of time.

Further, as a member that pivotally supports the support member with respect to the stay, a headrest using a bolt penetrating the stay and the support member and a nut screwed to the bolt instead of the pivot pin is also known ( For example, in Japanese Utility Model Application No. 61-150863, No. 5
If a bolt and a nut are used, the nut may loosen over time, the bolt may rotate, the pressure applied by the disc spring may weaken, and the friction between the stay and the support member may decrease.
However, in the example of the present invention, since the pivot pin 10 is used and the tip portion is swaged, the pivot pin 10 is loosened and the disc spring 11 is loosened.
The pressing force of does not decrease. Also, the pivot pin 10 is the first
It is a stepped pin having a shaft portion 103 and a second shaft portion 104 having a smaller diameter than the shaft portion. The disc spring 11 is fitted to the second shaft portion 104, and the length L of the first shaft portion 103 is constant. Therefore, the pressure applied by the disc spring 11 is always kept constant and does not change with time.

Further, when the bolt and the nut are used, the number of parts is increased by the amount of the nut and the weight is increased as compared with the case where the pivot pin is used.

INDUSTRIAL APPLICABILITY The present invention can be applied not only to seats used for automobiles and houses, but also to headrests attached to seats for various purposes.

[Effect of device]

As described above, according to the present invention, the operation feeling when the headrest body is tilted can be enhanced, and the operation force required for tilting the headrest body can be kept constant for a long period of time.

[Brief description of drawings]

FIG. 1 is a front view of a headrest, in which a headrest body and a seat back are represented by chain lines, and FIG.
FIG. 3 is a right side view of the headrest shown in the figure, FIG. 3 is an exploded perspective view of a pivot pin, a stay fitted to the pivot pin, a support member, a disc spring and a press washer, and FIG. 4 is a sectional view taken along line IV-IV of FIG. ,
FIG. 5 is an exploded perspective view similar to FIG. 3, showing the configuration of the conventional proposal. 1 …… Seat back, 2 …… Headrest 3 …… Stay, 4 …… Headrest body 5 …… Supporting member, 10 …… Pivot pin 11 …… Disc spring, 12 …… Presser washer

Claims (1)

[Scope of utility model registration request] 1. A stay fixed to a seat back, a headrest main body for supporting a head of a seated person, a support member for supporting the main body, and a pivot pin for supporting the support member so as to be tiltable with respect to the stay. A disc spring fitted to the pivot pin in contact with the support member and a press washer fitted to the pivot pin in contact with the disc spring are provided, and the tip end of the pivot pin protruding from the washer is attached. By squeezing, the disc spring is pressed against the support member via the press washer, the peripheral edge of the disc spring is pressed against the support member, and the support member is pressed against the stay to generate a frictional force therebetween. In the headrest of the seat to be tightened, the pivot pin is rotatably fitted to the stay, and is fitted to the support member, the disc spring and the press washer so as not to be relatively rotatable. Sheet Headrest.